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by jzu
Thu Oct 10, 2013 8:08 pm
Forum: Advanced users
Topic: Boot with SD readonly?
Replies: 36
Views: 24410

Re: Boot with SD readonly?

Glad your system works, and your issue is interesting as it is typical of embedded systems with read-only filesystems and volatile ram disks. Of course, a blank ramfs is created at boottime, and it needs to be populated if some software is configured so as to write in one of its subdirectories. In y...
by jzu
Mon Jan 28, 2013 11:45 am
Forum: Advanced users
Topic: Boot with SD readonly?
Replies: 36
Views: 24410

Re: Boot with SD readonly?

This means you run your RP with the original fstab when you are installing/compiling/modifying new soft, and when everything works, you use this modified fstab ? did I get this right ? suis meilleur en français .. Actually, this is my default fstab. Prior to to editing/modifying anything, I use the...
by jzu
Wed Oct 24, 2012 1:28 pm
Forum: Advanced users
Topic: Boot with SD readonly?
Replies: 36
Views: 24410

Re: Boot with SD readonly?

Remember my previous post with the /etc/fstab file? It works with minimal hassle, plus you can modify the contents on another computer.
by jzu
Fri Jul 20, 2012 11:47 am
Forum: Français
Topic: Présentation
Replies: 63
Views: 12987

Re: Présentation

Salut à tous, Je m'appelle Jean, de Paris, 52 ans, et j'ai commencé à programmer à la fac en Fortran IV sur cartes perforées... Depuis, j'ai fait un peu de tout, développement Pascal, C, Java, Perl et Javascript, admin sys (Unix), consulting, support, et j'avoue une certaine faiblesse pour le monde ...
by jzu
Fri Jul 20, 2012 11:21 am
Forum: Advanced users
Topic: Boot with SD readonly?
Replies: 36
Views: 24410

Re: Boot with SD readonly?

Here's my /etc/fstab which has been successfully tested by unplugging the power supply while running massive read operations (find /). proc /proc proc defaults 0 0 /dev/mmcblk0p1 /boot vfat ro 0 0 /dev/mmcblk0p2 / ext4 ro 0 0 none /var/run ramfs size=1M 0 0 none /var/log ramfs size=1M 0 0 Any idea t...
by jzu
Thu Dec 29, 2011 10:38 am
Forum: General discussion
Topic: Which language would you choose to teach programming on the RPi?
Replies: 47
Views: 10988

Re: Which language would you choose to teach programming on the RPi?

<t>JamesH said: <br/> <br/> <br/> Not sure why a search didn't bring up anything - there are pages and pages of forum comments on just this subject.<br/> <br/> <br/> <br/> Silly me - you're right. The default search looks in the "Current Forum", and obviously much more came when I selected "All Foru...
by jzu
Wed Dec 28, 2011 4:54 pm
Forum: General discussion
Topic: Which language would you choose to teach programming on the RPi?
Replies: 47
Views: 10988

Re: Which language would you choose to teach programming on the RPi?

<t>Search didn't give me relevant results... Still, this is one of the reasons for the RPi's existence.<br/> <br/> My son is nearly 15 and I'd like to teach him a bit of programming. I don't think he will become a pro coder, but he should see what happens when you tell a machine to do something. In ...
by jzu
Sat Nov 26, 2011 1:24 pm
Forum: General discussion
Topic: Will you get the A or B? Why?
Replies: 56
Views: 11128

Re: Will you get the A or B? Why?

First, a model B as a development platform, then a few As for my \"production\" embedded music projects, where a network connection would be useless. Then another B for an always-on ssh/mail/web/diaspora/[whatever] server at home.
by jzu
Wed Nov 23, 2011 1:18 pm
Forum: Other projects
Topic: Guitar amp modelling
Replies: 25
Views: 14980

Re: Guitar amp modelling

<t>You should stay clear from these ultra-cheap dongles you find on eBay, believe me, I tried them. You get sound, all right, and a lot of noise too. I'm currently testing the Behringer UCA202 reiuyi was talking about. This is way better. Its form factor matches the RPi Gerber I've printed a few day...
by jzu
Mon Nov 21, 2011 8:27 pm
Forum: General discussion
Topic: How would you use a Raspberry Pi device?
Replies: 514
Views: 204764

Re: How would you use a Raspberry Pi device?

<t>My home computer is currently always on because I use it to read my mail with mutt (ncurses MUA... yes, I'm an old fart) and sometimes transfer files. A Raspberry Pi could easily replace this power-hungry monster in this context. Plus, I could set up the WoL feature and send a magic packet to boo...
by jzu
Tue Nov 08, 2011 6:28 am
Forum: General discussion
Topic: Search forum quirk
Replies: 9
Views: 1994

Re: Search forum quirk

Usually, Google acts as a decent replacement (using "site:http://www.raspberrypi.org")... but it doesn't work here since the forum is not indexed.
by jzu
Tue Nov 01, 2011 10:17 am
Forum: General discussion
Topic: Doomed to use Powered Hubs
Replies: 66
Views: 9982

Re: Doomed to use Powered Hubs

<r>I beg to differ.<br/> <br/> <I><s>[i]</s>Providing<e>[/i]</e></I> still 5V is always better.<br/> <br/> <I><s>[i]</s>Accepting<e>[/i]</e></I> 6 to 20V would have been nice for money-tight hackers in developing countries. This should be alleviated somewhat in the next years when 5V-micro-usb wall ...
by jzu
Tue Oct 25, 2011 1:23 pm
Forum: Other projects
Topic: Guitar amp modelling
Replies: 25
Views: 14980

Re: Guitar amp modelling

From what I read somewhere else on this forum, the quality of the embedded PWM output could be pretty good, but we'll need an input device anyway.
by jzu
Tue Oct 18, 2011 11:26 am
Forum: Other projects
Topic: Guitar amp modelling
Replies: 25
Views: 14980

Re: Guitar amp modelling

Back after a bit of homework. The ARM integrated FPU itself could handle float and double operations in a standard/transparent way. Now, what could be done with the GPU? Are there software components around, which would allow us to offload some of the math-intensive computing?
by jzu
Thu Oct 13, 2011 8:04 pm
Forum: Other projects
Topic: Guitar amp modelling
Replies: 25
Views: 14980

Re: Guitar amp modelling

<t>The ">20 ms" number comes from recording both the sound of the strings and the output through an amp with a microphone into Audacity, and measuring the time between the dry signal and the processed one. I have yet to try to tune this module parameter, however - thanks for the tip.<br/> <br/> This...
by jzu
Wed Oct 12, 2011 8:46 am
Forum: Other projects
Topic: Guitar amp modelling
Replies: 25
Views: 14980

Re: Guitar amp modelling

<t>My own project, a real-time audio processor for guitar, currently runs on a Debian Slug (Linksys NSLU2, no FPU) with an USB interface using the ALSA API. Of course, I intend to port it on the Raspberry Pi, which should be a breeze. The effects I wrote include a delay, a flanger, and a distortion....
by jzu
Tue Oct 11, 2011 3:51 pm
Forum: Other projects
Topic: Guitar amp modelling
Replies: 25
Views: 14980

Re: Guitar amp modelling

Do you really need to use Jack on a dedicated box, one which would have no user interface bar a few pushbuttons? Wouldn't a pure ALSA program perform better in this context?
by jzu
Tue Oct 04, 2011 3:59 pm
Forum: Other projects
Topic: Diaspora "SEED"
Replies: 15
Views: 8065

Re: Diaspora "SEED"

<t>Raspberry Pi and Diaspora*: a perfect match. The problem right now with D* is that it is difficult for anyone to host a pod. I can do that, but Joe Six-Pack can't. Now, imagine a small box, which could come preloaded with the software, that we could plug into our router, which would discuss with ...
by jzu
Tue Sep 20, 2011 11:29 am
Forum: General discussion
Topic: Some very good audio news
Replies: 32
Views: 6195

Re: Some very good audio news

I hope it's cat-proof, too. This might prove a little more difficult to achieve: http://www.lsu.edu/deafness/He.....nge.html... Do you know what's the frequency, Kenn... um, Liz? ;)
by jzu
Mon Aug 29, 2011 3:15 pm
Forum: Other projects
Topic: Multiroom Audio System
Replies: 53
Views: 21816

Re: Multiroom Audio System

<r>Quote from DanielSilva on August 29, 2011, 15:52<br/> <br/> I'm just going by a cost perspective here, to me anything that costs more than the board itself ( $35 ) isn't worth it., even $25 dollars for a usb dongle is pushing it a bit.<br/> <br/> Unfortunately, a good DAC is costly - the word "co...
by jzu
Mon Aug 29, 2011 2:29 pm
Forum: Other projects
Topic: Multiroom Audio System
Replies: 53
Views: 21816

Re: Multiroom Audio System

<t>Quote from DanielSilva on August 29, 2011, 15:06<br/> <br/> In the $25~$30 i would also look at the Creative X-Fi Go!, it's not bad for the price and it's pretty compact. I just striped the case ( If you're not worried with warranty like me ), de-soldered both usb ports ( dongle and the board i w...
by jzu
Mon Aug 29, 2011 1:39 pm
Forum: Other projects
Topic: Multiroom Audio System
Replies: 53
Views: 21816

Re: Multiroom Audio System

<r>Believe me, you don't want these C-Sound dongles for a home audio system. They're ok if you want to connect low-quality headphones, but that's about it.<br/> <br/> I have an ART USB Phono Plus (<URL url="http://www.artproaudio.com/pro.....038;id=128">http://www.artproaudio.com/pro.....038;id=128<...
by jzu
Sat Aug 27, 2011 8:06 pm
Forum: General discussion
Topic: How would you use a Raspberry Pi device?
Replies: 514
Views: 204764

Re: How would you use a Raspberry Pi device?

<r>Cool device for an Arduino, which lacks pretty much everything in the audio-video area, but I think the Raspberry would match its raw capabilities anyway. The problem lies in writing a compatibility layer with a totally different hardware, including the Motorola 32-bit processor and the famed Ami...
by jzu
Sat Aug 27, 2011 6:48 pm
Forum: General discussion
Topic: How would you use a Raspberry Pi device?
Replies: 514
Views: 204764

Re: How would you use a Raspberry Pi device?

You would need to emulate the custom chipset as well (raster graphics with genlock, audio). Not for the faint of heart...
by jzu
Mon Aug 22, 2011 9:13 am
Forum: General discussion
Topic: microphone input?....on rasberry pi
Replies: 15
Views: 8649

Re: microphone input?....on rasberry pi

<r>Quote from vinceAPPLE on August 16, 2011, 04:06<br/> <br/> <URL url="http://cgi.ebay.com/USB-5-1-Au.....2a133a1ec5">http://cgi.ebay.com/USB-5-1-Au.....2a133a1ec5</URL><br/> <br/> These are very good cards. ALthough the mic input is at Line level so needs<br/> a powered mic. (high power mic)<br/> ...

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